Malicious PDF — malware analysis report

Static analysis result for SHA-256 61232f4e266fab10…

MALICIOUS

PDF

76.2 KB Created: 2021-03-30 08:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66c02f10bd775fac95cbfceb59e25c12 SHA-1: dd214008f0a207c11106d7803fd515bca873d54e SHA-256: 61232f4e266fab10269ef6bf160d8be08a47ec88e93a04d9e598dec01933d9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM specifically flags the presence of a large number of external links. ClamAV detection and ML classification confirm the malicious nature of the file, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=alimentos+ricos+en+yodo+pdf
    • http://republvinb.fun/feeling_words_list_for_adultsi9hq1.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fdc171f5725e.pdf
    • http://nijeratazuw.iblogger.org/the_evil_dead_full_movie_tamil.pdf
    • http://lavorunolutoga.22web.org/conditional_probability_worksheet_12_2_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5ff451bdcf3a5.pdf
    • http://tameeniraq.com/3035922875570l05.pdf
    • https://cdn-cms.f-static.net/uploads/4444110/normal_6017386db6ab4.pdf
    • https://cdn-cms.f-static.net/uploads/4390074/normal_601a25a2a3117.pdf
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fdc47a4d130a.pdf
    • https://kotafogora.weebly.com/uploads/1/3/4/3/134322717/1407b18174e2835.pdf
    • https://cdn-cms.f-static.net/uploads/4450355/normal_60518252a7e85.pdf
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6054b0b68c33a.pdf
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5ff516c8313ef.pdf
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/gamimapajex.pdf
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fe0c67250601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/160281e9-3bd4-474c-a407-ecb3e626ad34/hp_laserjet_p3015_toner_ce255a.pdf
    • https://uploads.strikinglycdn.com/files/74843f54-5c0c-4949-bd33-807112dd0b17/basic_french_verbs_conjugation_chart.pdf
    • http://mugoxox.epizy.com/acrobat_reader_and_editor.pdf
    • https://uploads.strikinglycdn.com/files/357c6287-74dd-43f3-8f3a-b46abe8e2568/jezupi.pdf
    • http://xuwewodufot.rf.gd/score_sheet.pdf
    • http://punexowimuseva.epizy.com/netflix_apple_ios.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1e.bin
1fe4e37c4213e4a6776c5b041093ecaff84855c127742e9137cb5bf6cc95ff9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5180 bytes
font_01_sfnt_off0000fbb5.bin
19990f0f05492195a5bcf3a0ed1b374597173a23c0a382290cfcce2fecad1712		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 12124 bytes

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